The question is: why? And the answer is the same mode of thinking that still pollutes the minds of the apologists on this board...this notion that NU can't compete consistently because we have to have higher standards for athletes than everybody else. This is (1) a crutch and (2) simply not true. This mindset needs to be changed. There is simply no downside whatsoever to it.
No, the mindset is that having a bunch of guys who struggle their way through NU affects the experience of other students (and that those guys take the place of otherwise-deserving applicants).